Adding-machine



(No Model.)

W. M. FITZWATER. ADDING MAOHINE.

No. 432.393.' Patented July 15, 1890.

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` UNITED STATES PATENT OFFICE.

VILLIAM M. FITZVATER, OF lVIII'IE FORGE, VIRGINIA.

ADDING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 432,393, dated July 15,1890.

Application filed March 4, 1890. Serial No. 342,534. (No model.)

` sl'o all whom it may concern:

Be it known that I, WILLIAM M. `FrrzwA- TER, acitizen of the UnitedStates of America, residing at Vhite Forge, in the county ot' Scott andState of Virginia, have invented certain new and useful Improvements inAddin g-Machines, of which the followingis a specification, referencebeing had therein to the accompanying drawings.

This invention pertains to certain new and useful improvements in addingmachines, having for its object the production of simple andhiglIly-eiiicient means for readily and accurately adding a series ofnumbers.

The invention comprisesaseriesof disks representin g nu mbers ofdifferentvalue, each disk being divided off into a series of numbersrepresented by dilferent-colored spaces to aid in the calculation oraddition; and it also comprises the detail construction, combination,and arrangement of parts, substantially as hereinafter fully set forth,and particularly pointed out in the claims.

In the accompanying drawings, Figure 1 is a plan view of my improvedadding-machine with parts in dotted lines. Fig. 2 is a front elevation.erating mechanism.

Referring to the drawings, A designates a frame, of any preferred formof construction, preferably provided with parallel top and bottom piecesa a.

B designates a series of disks or dials formed on or secured to theupper surface of top piece a. Each disk or dial is divided off intoseparate spaces b, numbered, respectively, from one (l) to ten (l0.) Toaid in the rapidity of calculation, each half of each disk has itsspaces b of ditferentcolors--such as red, White, blue, yellow, andgreenwhich are repeated in the order named on the other half of thedisk. This is an important feature, since it greatly aids the operatorin calculating or adding.

C is a pointer moving over the end or unit disk B and provided with ashort handle d for turning. This pointer is rigidly secured on the upperend of a shaft D, supported by frame A. Upon this shaft is secured awheel dial.

Fig. 3 is a detail view of the op` cured fast upon a shaft c', alsosupported by frame A, or said wheel may be of any 1naterial and providedwith a rubber tire. This wheel is given a limited movement by lug d',whose teeth di engage therewith as pointer O passes from nine (9) to ten(l0) on the disk or Motion is imparted to pointer C of the second diskor dial through the movement of wheel F, which is continuously incontact with the toothed periphery of a wheel G, fast y upon shaft D',which is also provided with a wheel E', similar to wheel E. This wheel Ehas a toothed lug d', which engages a second intermediate wheel F',which is continuously in contact niith the toothed periphery of a wheelG on shaft D2, to which pointer O2 is secured. A wheel E2, provided witha toothed lug similar to lug d of wheel E, is secured fast upon shaftD2, and through the agency of the intermediate wheel F2 imparts motionto wheel G2 of shaft G3, carrying pointer O3. In this manner motion maybe transmitted to any number of Wheels or pointers.

It will be understood that the pointer of cach successive disk or dialis onlymoved one point as the pointer of the next lowerdisk or dial hasbeen moved ten points or made one completerevolution.

As constructed, my adding-machine is composed of parts extremely simplein construction and arrangement, and which permit of ready and easymanipulation.

By making the intermediate wheels of rub ber the complete device isrendered much lighter in weight, and these wheels will not be injured byconstant use, and the contact of the teeth is always rendered certain.

I claim as my inventionl. In an adding-machine, the combination, withthe disks or dials, and the series of Wheels having teeth and the wheelshaving toothed lugs, of the intermediate wheels of rubber, with whichengage the teeth of said wheels and lugs, as and for the purpose setforth.

2. The herein-described improved adding machine, consisting of the framehaving on its oppor surface :L serios of disks or dials, hc tooth of thewheels, nr; G, and the toothed 1o iho serios of Shafts Soom'ed iusuidEmme :md lugs, all. construotod md zu'l'm'lgod Substan- Czu'l'yngpoint/01S nthcl' upper ends plfotizdly as :sot i'ol'th.

jocicd ovm said d 1 S m' dials, tho wheohi, aS In tes'mouywhereof Izlf'lxv my Signature in 5 E, fasi; ou such Shafts having toothed luga,presence of: two wtuosos.

tho toothed Wheels, ns G, also fast ou said YY'UJLIAM M. FTZWA'IICR.

Shafl, tho imm-mediato rubber whoolS7 as F, 1 nofsos:

Togohorwiih their Shzdl,hoi-Ween@hoh sel-ies 1 J. NOTA MCGILL,

